These brackets are the same brackets that come inside part number 30035 (Ten Bolt Rails). Included are four "L" shaped brackets. You will get two short "L" brackets and two tall "L" brackets. Hardware or rails are NOT included.
Measurement of the SHORT brackets- 2-" Wide x 5-5/8" Tall x Round hole diameter is 9/16"
Measurement of the TALL brackets- 2-" Wide x 6-7/8" Tall x Round hole diameter is 9/16"
If you need JUST the hardware to mount these four "L" shaped brackets to ten bolt rails, you need part number 58164. If you need the four "L" shaped brackets WITH the hardware kit, order part number 30439.